In certain forms of synesthesia / ideasthesia , perceiving letters and numbers ( grapheme–color synesthesia ) or hearing musical sounds (music–color synesthesia) will lead to the unusual additional experiences of seeing colors. Behavioral and functional neuroimaging experiments have demonstrated that these color experiences lead to changes in behavioral tasks and lead to increased activation of brain regions involved in color perception, thus demonstrating their reality, and similarity to real color percepts, albeit evoked through a non-standard route.
Pure Black and Pure Blue – Pure black Frenchies (Frenchies with a black coat with no brindling) are disqualified for conformation competitions, probably because it was initially thought that this was a dominant characteristic and would overpower other colors. It is now known that pure black is caused by a recessive gene on the A-locus which is rare and must be inherited from both parents. These are very beautiful and expensive dogs. The pure blue is even more rare in that pure blue Frenchies (blue with no brindling) must inherit both the recessive black gene and the recessive dilute gene from both parents. Both the pure black and the pure blue color Frenchies also come in pieds when one of these gorgeous puppies also inherits the recessive pied gene from both parents.